package pl.wroc.pwr.image.converter;

import pl.wroc.pwr.IOperator;
import pl.wroc.pwr.image.IGSImage;
import pl.wroc.pwr.image.IRGBImage;
import pl.wroc.pwr.image.model.GSImage;
import pl.wroc.pwr.imagechannel.IImageChannel;

public class RGBtoGSConverter implements IOperator< IGSImage >
{	
	public IRGBImage inputImage;
		
	public RGBtoGSConverter( IRGBImage image )
	{
		this.inputImage = image;
	}
	
	public void setImage( IRGBImage image )
	{
		this.inputImage = image;
	}

	public IGSImage apply( )
	{
		IGSImage outputImage = new GSImage( this.inputImage.getSize( ) );
		IImageChannel grayChannel = outputImage.getGrayChannel( );
		for ( int i = 0; i < this.inputImage.getRedChannel( ).getMaxIndex( ); i++ )
		{
			grayChannel.setValue( i, 
					( this.inputImage.getRedChannel( ).getValue( i ) + 
					  this.inputImage.getGreenChannel( ).getValue( i ) +
					  this.inputImage.getBlueChannel( ).getValue( i ) ) / 3.0f );
		}
		return outputImage;
	}
}